举一反三
- [0,2,2,3,3]为来自均匀分布总体的样本观测值,则的矩估计值为( )。https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/c8b884ce79a046b3b80e8bc71a4eb112.png
- 设[0,1,0,1,1]为来自两点分布总体的样本观测值,的矩估计值为()。 A: 1/5 B: 2/5 C: 4/5 D: 3/5
- 设[0,1,0,1,1]为来自两点分布总体[img=156x70]17da6b4e214ea6f.png[/img]的样本观测值,[img=48x52]17da6b4e3147b88.png[/img]的矩估计值为()。 A: 2/5 B: 3/5 C: 1/5 D: 4/5
- 设[0,1,0,1,1]为来自两点分布总体[img=156x70]17869d84d3ac94b.png[/img]的样本观测值,[img=48x52]17869d84e4143f5.png[/img]的矩估计值为( )。 A: 1/5 B: 3/5 C: 2/5 D: 4/5
- 设总体X服从参数为p的0—1分布,(0,1,0,1)是样本的观测值,则p的矩估计[img=10x23]18034e68b9b1e32.png[/img]为( ). A: 1/4 B: 1/2 C: 3/4 D: 1
内容
- 0
设是正态总体的总体容量为2的样本,为未知参数,则的无偏估计是( )。https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/bc800973e9f644959dab1f715bb9d2db.png
- 1
[0,2,2,3,3]为来自均匀分布总体的样本观测值,则的矩估计值为()。 A: 4 B: 1 C: 3 D: 2
- 2
通过点<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/a13927df1bf542dfa036a32b10364f69.png" />的拉格朗日插值基函数<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/65695a42c7a14b649b6aa4fb68f7e499.png" />满足( ) A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/99af333f3e934ef6a75022ee1e728b53.png" />=1,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/7769611ac5cd4c93975be7c41a49ae71.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/99af333f3e934ef6a75022ee1e728b53.png" />=1,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/7769611ac5cd4c93975be7c41a49ae71.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/99af333f3e934ef6a75022ee1e728b53.png" />=0,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/7769611ac5cd4c93975be7c41a49ae71.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/99af333f3e934ef6a75022ee1e728b53.png" />=0,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/f80e8e400f3f4916bcaf6b5fde757f16.png" />
- 3
为使锅垢中难溶于酸的CaSO4转化为易溶于酸的CaCO3,常用Na2CO3处理,反应式为CaSO4+CO32-<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/88320eab77594b6abf0039ab0efe3c57.png" />CaCO3+SO42-,此反应的标准平衡常数为()。 A: K<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/e8c371ce6b96487e829331bb8dee134f.png" />(CaSO4)·K<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/e8c371ce6b96487e829331bb8dee134f.png" />(CaCO3) B: K<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/e8c371ce6b96487e829331bb8dee134f.png" />(CaCO3)/K<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/e8c371ce6b96487e829331bb8dee134f.png" />(CaSO4) C: [K<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/e8c371ce6b96487e829331bb8dee134f.png" />(CaSO4)·K<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/e8c371ce6b96487e829331bb8dee134f.png" />(CaCO3)]1/2 D: K<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/e8c371ce6b96487e829331bb8dee134f.png" />(CaSO4)/K<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/e8c371ce6b96487e829331bb8dee134f.png" />(CaCO3)
- 4
下图电路ab端的等效电阻为____Ω()<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/467e7c93e1bf491582e0a57566fa878e.png" > A: 1.2 B: 1 C: 2 D: 0.4